Yes, of course we are entitled to change our minds...
"I grew up reading Ayn Rand and it taught me quite a bit about who I am and what my value systems are and what my beliefs are. It's inspired me so much that it's required reading in my office for all my interns and my staff." --Paul Ryan, 2005
"I reject her [Ayn Rand's] philosophy. It's an atheist philosophy. It reduces human interactions down to mere contracts and it is antithetical to my worldview. If somebody is going to try to paste a person's view on epistemology to me, then give me Thomas Aquinas. Don't give me Ayn Rand." --Paul Ryan, 2012